linux-kernel - Re: [PATCH net-next 5/5] gve: Add flow steering ethtool support

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Date: Thu, 9 May 2024 17:19:00 -0700
From: Ziwei Xiao <ziweixiao@...gle.com>
To: Markus Elfring <Markus.Elfring@....de>
Cc: Jeroen de Borst <jeroendb@...gle.com>, netdev@...r.kernel.org, 
	kernel-janitors@...r.kernel.org, 
	Harshitha Ramamurthy <hramamurthy@...gle.com>, Praveen Kaligineedi <pkaligineedi@...gle.com>, 
	Willem de Bruijn <willemb@...gle.com>, LKML <linux-kernel@...r.kernel.org>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, John Fraker <jfraker@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
	Peter Zijlstra <peterz@...radead.org>, Shailend Chand <shailend@...gle.com>, rushilg@...gle.com
Subject: Re: [PATCH net-next 5/5] gve: Add flow steering ethtool support

On Wed, May 8, 2024 at 7:09 AM Markus Elfring <Markus.Elfring@....de> wrote:
>
> …
> > +++ b/drivers/net/ethernet/google/gve/gve_ethtool.c
> …
> > +static int gve_get_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd, u32 *rule_locs)
> > +{
> > +     struct gve_priv *priv = netdev_priv(netdev);
> > +     int err = 0;
> > +
> > +     dev_hold(netdev);
> > +     rtnl_unlock();
> …
> > +out:
> > +     rtnl_lock();
> > +     dev_put(netdev);
> > +     return err;
> > +}
> …
>
> How do you think about to increase the application of scope-based resource management
> at such source code places?
>
Is the suggestion to combine dev_hold(netdev) together with
rtnl_unlock()? If so, I think there might be different usages for
using rtnl_unlock. For example, some drivers will call rtnl_unlock
after dev_close(netdev). Please correct me if I'm wrong. Thank you!

> Regards,
> Markus